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Exam CCFA topic 1 question 128 discussion

Actual exam question from CrowdStrike's CCFA
Question #: 128
Topic #: 1
[All CCFA Questions]

When creating a custom IOA for a specific domain, which syntax would be best for detecting or preventing on all subdomains as well?

  • A. .*\.baddomain\.xyz|baddomain\.xyz
  • B. **baddomain\.xyz|baddomain\.xyz**
  • C. .*baddomain\.xyz|baddomain\.xyz.*
  • D. Custom IOA rules cannot be created for domains
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Suggested Answer: A 🗳️

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kitkat007
1 month, 3 weeks ago
Selected Answer: A
A. .*.baddomain.xyz|baddomain.xyz This syntax ensures that all subdomains of baddomain.xyz (e.g., sub.baddomain.xyz) as well as the domain itself (baddomain.xyz) are covered. The .*\. part before the domain captures any subdomain, while baddomain\.xyz matches the domain itself. The pipe (|) acts as an OR operator
upvoted 1 times
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p3n3tr4t0r
3 months, 4 weeks ago
Selected Answer: C
C is correct. Checked on training
upvoted 1 times
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Muffen
6 months, 4 weeks ago
Selected Answer: A
Disagree with Brian. C is not specific enough and would match things like notabaddomain.xyz and baddomain.xyz.com A is the best solution for specifically looking for subdomains of baddomain.xyz or just the domain itself which is what the question asked for.
upvoted 3 times
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Brian9296
11 months, 2 weeks ago
Selected Answer: C
Tested in UI
upvoted 2 times
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A (35%)
C (25%)
B (20%)
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